Two of Vincent Audio's most popular products are getting an upgrade. High performance versions of both the SA-31 preamplifier and SP-331 Class AB amplifier (noted by the addition of MK to the end of the model number) are now available.

The SP-331 MK is based on the Class AB amplifier, but it's now a Class A/AB amp. Its output stage operates in Class A mode for signals under 10 Watts, from there it kicks up to AB for a total output of 150 Watts at 8 Ohms. Vincent says that this helps reveal subtle detail in music that's otherwise hard to produce.

The SA-31 MK preamp is also newly configured for Class A operation. Vincent has added a pair of 6N16 vacuum tubes to the new output stage. The new model also ups the inputs from four to six and includes a wireless remote control. Both the SA-31 MK ($2,199) and SP-331 MK ($1,399) are available now in silver and black finishes.